Burglar alarm



R. KOEHLER. BURGLAR ALARM. APPLICATION FILED FEB. I7, 1919.-

1,429,595, Patenteasep. 19, 1922.

Patented Sept.. 19, 1922.

RUDOLPH KOEHLER, OF ST. LOUIS, MISSOURI.

BURGLAR ALARM.

Application filed February 17, 1919. `Serial No'. 277,452.

To all whom t may con/cern Be it known that l, RUDOLPH KonHLnn, a citizen of the United States of america, and a resident of the city of St. Louis and State of Missouri, have invented certain new and useful Improvements in a Burglar Alarm, of which the following is a specification.

The primary object of this invention is to provide an improved burglar alarm which is wholly concealed and operably related with doors or windows.

Another object is toprovide an improved burglar alarm that is key controlled from opposite sides of a door.

A further object is in providing an improved burglar alarm that is applicable to swinging and sliding doors.

Other and further objects will appear in t-he specification and be specifically pointed out in the appended claims, reference being had to the accompanying drawings exemplifying the invention,A and in which,

Figure 1 is a fragmentary side elevation of a portion of a door and its frame, and showing this improved burglar alarm in dotted lines, carried by said door.

Figure 2 is an elevation of the door edge, showing the operative location of this improved burglar alarm thereto.

Figure 3 is a longitudinal vertical section taken approximately on the line lll-lll of Fig. 2. showing ythe operating parts of the alarm lin positions they will assume after the alarm has been actuated.

Figure et is a horizontal section taken on the line IV-IV of Fig. 1.

Figure 5 is a horizontal section taken on the line V-V of Fig. 1.

As shown inthe drawings this improved burglar alarm is embedded or mortised in a'door, and comprises a' housing' 1 having a cover plate 2, and formed integral with the front portion of said housing is a face plate 3. This housing 1 is mounted in a mortise t which is formed in the door 5, and the face plate 3 is embedded in the front door edge 6 of the door7 said faceplate and housing carried thereby and cover plate ,of

said housing being securely held in position in the door by the screws 7 which are passed through said face plate adjacent each end.

l-lorizontally arranged and reciprocallv mounted between guiding portions 8 and located adjacent the top wall 9 of said housing 1 is a trigger releasing member 10 which is actuated by a coil'spring 11, said member 10 having a forward portion 12 vwhich is adapted to project through an opening 13 which is formed in the front plate 3.

Forlimhiting the travel of said member 1() a projecting pin la is provided, said pin passing through a slot 15 which is formed in the member 10, and is secured to the side wall 16 of the housing 1.

Formed on the underside of the member 10 is a notch 17 and in engagement with said notch is the engaging end 18 of a trigger 19, said trigger being pivotally mounted at 20 to the side wall 16 of the housing.

Carried by said trigger isa seating portion 21 which is adapted to engage beneath apset collar 22 which carried by a firing pin 23 having a striking end 24. rlhis firing pin 23 isy vertically and parallelly arranged relative to theA front plate 3, and there being a pair of guiding portions 25 formed integral with said plate 3 through which said firing pin reciprocates.

Mounted on said ring pin 23 and arranged between the collar 22A and the'uppermost guiding portion 25 is a coil, spring 26, and extending from said collar is a finger engaging portion 27, said linger engaging portion projecting through a vertical slot 28 which is formed in the front plate 3.

In aliiieinent with the striking end 24 of the firing pin 23 is a cartridge chamber 29, the lower end of said chamber being curved as designated at v30, andthe discharge end 31 of said, chamber being formed in the front plate 3. Formed in said front plate 3 above the discharge opening 31 of the chamber 30 is an opening32 covered by a spring closed trap door 33, said door being swingingly mounted to said front plate by the pin 34Q This door provides access to the cartridge feeding end of the chamber 29.

Mounted in the housing` 1 is a key lock 35 which is preferably of the Yale type and firing pin 23 being released and striking the cartridge 3S contained in the firing chamber. From the dotted positions of the parts shown in Fig. 1, all of the parts are in Operative positions relative to giving an alarm when the door is opened, the parts being primarily held in their positions by the releasing member 10, in which the forward portion 12 thereof is resting against the facing edge of the door frame 39, the cooperating spring 11 of said member 10 being held compressed. ln this rearward position of the releasing member 10 the trigger 19, which is to be operated thereby has its seating portion 21 engaged against the underside of the set collar 22, and in which the firing pin of said set collar is held in its upwardly drawn position, thereby compressing the firin pin spring 26. ln the event of the door being opened by an unauthorized person, as soon as the front edge 6 of the door has been swung` away from the door frame 39, the forward portion 12 of the releasing member 10 will be released from engagement with said door frame and the spring 11 of said member 1() will become active on said member, thereby pushing said member forwardly or outwardly, and incidentally swinging the upper end of the trigger 19 forwardly and releasing the seating portion 21 from engagement with the set collar 22, at which time the firing pin spring 26 will forcibly drive said firing pin downwardly, thereby causing the striking end thereof to discharge the cartridge 38 which is contained in the chamber 29, and gives the alarm.

Assuming it is desired to open the door after the operating parts of the burglar alarm have been set, a key is inserted in the lock 35, thereby turning the latch from its downwardly depending position to an approXimately horizontal extending position as. shown in dotted lines, Fig. 1, and as de` signated by the numeral 37a, in which moved position the latch will engage the depending end of the trigger 19, thereby preventing said trigger yfrom being actuated by the releasing member 10 when the door is open. After this improved burglar alarm has been operated and it is desired to reset the same, the linger engaging portion `2"( of the firing pin set collar is engaged and elevated, then the releasingl member 1() is pressed inwardly into the housingl, and while said releasing member is held in the housing the latch 37 of the lock 35 is turned thereby holdingthe seating porti'on 21 of said trigger in under engagement with the setting collar 22 of the firing pin, in which position the firing pin is held against descending movement while the operator can reload the cartridge chamber 29 with an` other blank cartridge.

This reloading is done by the operator swinging open the door 33 and withdrawing the empty shell from the chamber, after which the new shell is introduced, then the door 33 is allowed to swing back into its flush position relative to the face plate 3.

When the lower end of the trigger 19 is engaged and held by the latch 37 of the lock 35 as previously described, the door can be opened and closed as desired withoutthe burglar alarm being effected, but when itv is desired to set the alarm ready for operation, the door is first closed so that the forward portion 12 of the releasing member 10 will be in a position to engage the door frame 39, then the latch 37 is turned away from the lower end of the trigger 19, thereby leaving the releasing member 10 in a position for outward movement by its spring and release the trigger of the firing pin the moment the door is opened by an intruder.

In as much as this improved burglar alarm is mortised in a door, it is concealed against being tampered with, and as a further proof against burglarizing, the same is enclosed in a metallic housing which can only be removed when the d'oor is open.

What I claim is:

l'. The combination of av door, a frame therefor' and a burglar alarm embedded in said door, said alarm comprising a reciprocally mounted firing pin, a cartridgechamber in alinement with said pin, a trigger for releasing said pin, a releasing member operable with said trigger adapted to bear against said frame, thereby preventing said pin from movement, and means operable with said trigger for preventing said releasing member from actuating said trigger.

2. In combination, a door, a frame therefor, a tripping device embedded in said door, said device having a part resiliently bearing against said frame and held from release thereby, a trigger co-operable with said de vice, an exploding elementv carried by said door adapted to be discharged when said trigger is actuated by said device when said part 'of said device. is moved from engage ment with said frame, and there being means co-operable with said trigger whereby said trigger will prevent said device from operating.

RUDOLPH KOEHLER 

